Benjamin  f



@uitrit tat-2s Altttimt BENJAMIN' It PERKNS, OF NORTH AB'ffktflS;-NIASSACHUSETTS Leners PawmNofregi-izi, ma Mai/3218; 186i:

lgs flnhnle rfemh it iu tigen Etnias zitnrt mit mating pmt if tigo time.

TO ALL WHOM IT MAY 4CONCERN:

Be it known that I, BENJAMIN F. PERKINS, of North Adams, in the countyof Berkshire, and State of Massachusetts, have invented a new and usefulImprovement in Vises; and I do hereby declare that the followingis afull, clear, and exact description of the construction and operation oftlie'snme, reference being had to the accompanying drawings, making apart of' this specification, in wliich- Figure 1 is a side elevation,part in section,oi` a vise-screw and lever. p

Figure 2, a front elevation, also part -in section, of the same, showingthe improvements.

The same letters indicate like parts in each of the figures. v

My improvement. consists in forming a recess in -the head of the screwD, as at A, iig. 1, and inserting therein a spring, made in any of theknown forms. It mayY be of lrubber or other elastic substance faced withmetal', but I prefer a curved steel spring, as represented at A, figs. land 2, of suiiicient rigidity to overcome the gravitation of the lever,C, and retain it in whatever position placed; but, it is free to move upor down, right or left, by applying sufficient force with tbe hand toovercome'tlie resistance of the spring B.

The advantage of this arrangement is that' an 'article can be heldvery`lightly in the vise; and the lever C placed in position to hold itthere without the liability of its sliding to one side and unscrewjngthe vise by its oWn gravitation, as is often the case with all the othervises. It can be operated much qnicker than with the old arrangement,and without the liability of pinching the operators lingers.

Having fully described my improvement, its construction and operation,what I claim as new, and desire to secure by Letters Patent, is*

I claim the spring B or its equivalent, in combination with screw D andlever C, as herein described, and for the purpose specified.

B. F. PERKINS.

Witnesses:

E. P. GABY, N. D. JOHNSON.

